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Kate and Prince William publicly marked Archie's first birthday by publishing a post on their Kensington Royal social media account. Their brief birthday message read: "Wishing Archie a very happy first birthday today!"

The Queen publicly marked Archie's first birthday (Image: THE ROYAL FAMILY TWITTER)

While Kate and Prince William are hundreds of miles away from their nephew Archie, the couple are believed to have found a way to celebrate together with their children the milestone birthday of the little Sussex.

Royal expert Katie Nicholl told OK! magazine: "The Queen will wish him happy birthday this week via Zoom as will the Cambridge children.

"They haven’t seen their little cousin in months so they’ve been looking forward to seeing how much he’s grown."

Kate and Prince William are self-isolating with Princess Charlotte, Prince George and Prince Louis at Anmer Hall, their Norfolk residence.

Archie is seventh-in-line to the throne (Image: EXPRESS)

Archie relocated to Los Angeles with his parents in late March, and the family-of-three is believed to be self-isolating near Hollywood.

The Cambridges haven't been the only royals to publicly mark Archie's birthday.

A few minutes after Kate and William tweeted their message, The Royal Family and Clarence House also wishes Archie a happy birthday.

The former account, which represents the Queen and Prince Philip, wrote: "Happy Birthday to Archie Mountbatten-Windsor who is celebrating his 1st birthday today!

"Archie is The Queen’s eighth great-grandchild."

Archie was born at the Portland Hospital in London (Image: GETTY)

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The Royal Family's Twitter account shared a picture of the Queen, Prince Philip and Doria Ragland depicting their first official meeting with Archie, two days after he was born.